While today's WOD seems like nothing more than 20 rounds of twenty one reps, it is actually a dirty disguise for overload training. To do it right, the wallballs would start at 20 and the kbs would start at 1. This way, as you are hitting fatigue, the weighted movement would increase in repetition thereby putting more stress on you and forcing an adaptation (i.e. increase) in your endurance and strength.
KB Cleans + Presses
3 x 2 x 10 (Mod to heavy weight)
20, 19, 18...1 KB Swings (53/35)
1, 2, 3...20 Wall Balls (20/14)